The Collaborative International Dictionary of English v.0.48:

Blunt \Blunt\ (bl[u^]nt), a. [Cf. Prov. G. bludde a dull or
   blunt knife, Dan. blunde to sleep, Sw. & Icel. blunda; or
   perh. akin to E. blind.]
   1. Having a thick edge or point, as an instrument; dull; not
      sharp.
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            The murderous knife was dull and blunt. --Shak.
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   2. Dull in understanding; slow of discernment; stupid; --
      opposed to acute.
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            His wits are not so blunt.            --Shak.
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   3. Abrupt in address; plain; unceremonious; wanting the forms
      of civility; rough in manners or speech. "Hiding his
      bitter jests in blunt behavior." "A plain, blunt man."
      --Shak.
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   4. Hard to impress or penetrate. [R.]
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            I find my heart hardened and blunt to new
            impressions.                          --Pope.
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   Note: Blunt is much used in composition, as blunt-edged,
         blunt-sighted, blunt-spoken.
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   Syn: Obtuse; dull; pointless; curt; short; coarse; rude;
        brusque; impolite; uncivil.
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The Collaborative International Dictionary of English v.0.48:

Blunt \Blunt\, v. t. [imp. & p. p. Blunted; p. pr. & vb. n.
   Blunting.]
   1. To dull the edge or point of, by making it thicker; to
      make blunt. --Shak.
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   2. To repress or weaken, as any appetite, desire, or power of
      the mind; to impair the force, keenness, or
      susceptibility, of; as, to blunt the feelings.
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The Collaborative International Dictionary of English v.0.48:

Blunt \Blunt\, n.
   1. A fencer's foil. [Obs.]
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   2. A short needle with a strong point. See Needle.
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   3. Money. [Cant] --Beaconsfield.
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WordNet (r) 3.0 (2006):

blunt
    adj 1: having a broad or rounded end; "thick marks made by a
           blunt pencil"
    2: used of a knife or other blade; not sharp; "a blunt
       instrument"
    3: characterized by directness in manner or speech; without
       subtlety or evasion; "blunt talking and straight shooting";
       "a blunt New England farmer"; "I gave them my candid
       opinion"; "forthright criticism"; "a forthright approach to
       the problem"; "tell me what you think--and you may just as
       well be frank"; "it is possible to be outspoken without being
       rude"; "plainspoken and to the point"; "a point-blank
       accusation" [syn: blunt, candid, forthright, frank,
       free-spoken, outspoken, plainspoken, point-blank,
       straight-from-the-shoulder]
    4: devoid of any qualifications or disguise or adornment; "the
       blunt truth"; "the crude facts"; "facing the stark reality of
       the deadline" [syn: blunt, crude(a), stark(a)]
    v 1: make less intense; "blunted emotions"
    2: make numb or insensitive; "The shock numbed her senses" [syn:
       numb, benumb, blunt, dull]
    3: make dull or blunt; "Too much cutting dulls the knife's edge"
       [syn: dull, blunt] [ant: sharpen]
    4: make less sharp; "blunt the knives"
    5: make less lively, intense, or vigorous; impair in vigor,
       force, activity, or sensation; "Terror blunted her feelings";
       "deaden a sound" [syn: deaden, blunt] [ant: animate,
       enliven, invigorate, liven, liven up]